Answer:
y = -x + 4
Step-by-step explanation:
Mathematically, the equation of a straight line is;
y = mx + b
where m is the slope and b is the y-intercept
from the plot, the y intercept is 4
So we have;
y = mx + 4
To get the value of m, we substitute the coordinates of any point and solve for m
we select the point; (4,0)
so;
0 = m(4) + 4
4m = 0-4
4m = -4
m = -1
so the equation of the line is;
I haven't done that type of math in a while but I cam up with 21 bookmarks
X=0 and X=-2
Move all terms to one side and set equal to 0. Then set each factor to 0 and solve.
X=0,-2
(using 
)
so we can replace the sin²x in the LHS expression as follows
which is the RHS.